81277434 has 48 divisors (see below), whose sum is σ = 201771648. Its totient is φ = 23162976.

The previous prime is 81277409. The next prime is 81277453. The reversal of 81277434 is 43477218.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81024 + ... + 82020.

It is an arithmetic number, because the mean of its divisors is an integer number (4203576).

Almost surely, 2^81277434 is an apocalyptic number.

81277434 is an abundant number, since it is smaller than the sum of its proper divisors (120494214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81277434 is a wasteful number, since it uses less digits than its factorization.

81277434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659 (or 1656 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 81277434 is about 9015.3998247443. The cubic root of 81277434 is about 433.1682946796.

The spelling of 81277434 in words is "eighty-one million, two hundred seventy-seven thousand, four hundred thirty-four".